Spontaneous formation of boron nitride nanotube fibers by boron impurity reduction in laser ablation of ammonia boraneopen access
- Authors
- Bae, Dong Su; Kim, Chunghun; Lee, Hunsu; Khater, Omar; Kim, Keun Su; Shin, Homin; Lee, Kun-Hong; Kim, Myung Jong
- Issue Date
- May-2022
- Publisher
- SPRINGER
- Keywords
- Boron nitride nanotubes; Laser ablation; Ammonia borane; Homogeneous nucleation; Spontaneous fiber formation; Pressure effect
- Citation
- NANO CONVERGENCE, v.9, no.1
- Journal Title
- NANO CONVERGENCE
- Volume
- 9
- Number
- 1
- URI
- https://scholarworks.bwise.kr/gachon/handle/2020.sw.gachon/84423
- DOI
- 10.1186/s40580-022-00312-y
- ISSN
- 2196-5404
- Abstract
- Highly crystalline and few-walled boron nitride nanotubes (BNNTs) had been synthesized by laser ablation using only ammonia borane as a precursor. As a molecular precursor, ammonia borane supplied both B and N atoms with a ratio of 1:1, and BNNTs were formed via the homogeneous nucleation of BN radicals, not the growth from boron nano-droplets, which is a generally accepted growth mechanism of the laser-grown BNNTs. Owing to the absence of amorphous boron impurities, the van der Waals interaction among BNNTs became effective and thus a BNNT fibers was formed spontaneously during the BNNT synthesis. The BNNT growth and the subsequent fiber formation are found to occur only at high pressures of a surrounding gas. The mechanism behind the critical role of pressure was elucidated from the perspective of reaction kinetics and thermal fluid behaviors. A polarized Raman study confirmed that the BNNT fiber formed exhibits a good alignment of BNNTs, which implies great potential for continuous production of high-quality BNNT fibers for various applications.
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